I think i got a teory that chunyoung will always waiting for dan-i even after dan-i already gone to her original world. What I mean is, it was like a spoiler lah, like after dan-i gone, none of them will remember her cause she already back but went it was on snowy days chunyoung will kept waiting for someone but he doesnt remember who he's waiting for ( that person he was waiting is dan-i but he doesnt remember)